CAJ | 학술논문

用强迫振动装置识别攻角从－3°～＋4°细化步长变化为1°的洞庭湖二桥主梁断面气动导数；将该气动导数拟合成折减风速、攻角的三维曲面，只需获取某一有效攻角的具体数值即可自动求得所有气动导数值。通过在 ANSYS中的三维 TABLE 表存储各攻角的气动导数，自动计入附加攻角对颤振稳定性影响。全模态颤振分析结果表明，附加攻角效应可降低该类桥梁的颤振临界风速。若按常规试验方法以3°攻角为步长进行气动导数插值计算，颤振分析有可能得到错误结论。
용강박진동장치식별공각종－3°～＋4°세화보장변화위1°적동정호이교주량단면기동도수；장해기동도수의합성절감풍속、공각적삼유곡면，지수획취모일유효공각적구체수치즉가자동구득소유기동도수치。통과재 ANSYS중적삼유 TABLE 표존저각공각적기동도수，자동계입부가공각대전진은정성영향。전모태전진분석결과표명，부가공각효응가강저해류교량적전진림계풍속。약안상규시험방법이3°공각위보장진행기동도수삽치계산，전진분석유가능득도착오결론。
Aerodynamic derivatives of Dongting Lake bridge girder sections were identified by forced vibration in wind tunnel,with the angle of attack changing in step of 1 °from -3 °to +4 °.The aerodynamic derivatives were fitted to form a three-dimensional surface made up by reduced velocity,angle of attack and aerodynamic derivatives.Only if a specific value of the effective angle of attack is given,all aerodynamic derivatives can be automatically obtained.The data of aerodynamic derivatives were stored in a three-dimensional TABLE in ANSYS,the effect of additional angle of attack on flutter stability was naturally concerned.A full-mode flutter analysis indicate that the additional angle of attack may decline the critical flutter speed of typical bridges and the influenced extent is according to the type of bridges.